I downloaded and installed GitHub (latest version) for OS X, installed command line utility under Github in the application and am coming up with an error trying to create my first readme file in a repo entitled "basic-twitbstrap".
Macbooks-MacBook-Pro-2:basic-twitbstrap macbook$ git init
-bash: git: command not found
I installed the latest version of Ruby Version Manager, then entered 'git' into the Terminal. It came up with a list of usage and common commands.
Now it runs.
Macbooks-MacBook-Pro-2:~ macbook$ git --version
git version 1.7.4.4